4 results about "Half-reaction" patented technology

This invention provides a method for determining the deactivation temperature and deactivation characteristics of a hydroformylation catalyst, comprising: S1. preparing a hydroformylation reaction solution; S2. measuring the reaction solution and placing it in an adiabatic testing instrument to simulate a hydroformylation reaction, stopping the heating when the temperature reaches T0 and incubating the reaction under adiabatic conditions; recording the temperature change and obtaining the highest temperature T. m S3. After cooling the test ball, remove half of the reactant material, add the hydroformylation reaction raw material, and heat up to simulate the hydroformylation reaction. When the temperature reaches T1, stop heating and perform an adiabatic reaction. Record the highest temperature T. mf S4. Compare T1 and T m and T mf If T mf =T1, catalyst deactivation temperature is T m Irreversible inactivation; if T mf =T m The catalyst deactivation temperature is T m Reversible inactivation; if T mf >T m Remove the material from the test sphere and repeat steps S2 to S4. The judgment method of this invention has a short testing cycle, high safety, and eliminates the need for sample separation and component analysis. It provides guidance for research on catalyst operating limits and the selection of homogeneous catalyst recovery temperatures.

The invention belongs to the technical field of electrochemical synthesis and isotope labeling, and particularly discloses a method for preparing a deuterated compound through electrochemical coupling and a special catalyst thereof. According to the invention, a carbon-hydrogen bond halogenation-dehalogenation deuteration process is coupled, a specific noble metal nitrogen-doped carbon catalyst is screened and applied as a cathode and anode catalytic material, a brand new electrochemical system is constructed for the first time, and under the environment-friendly reaction conditions of completely no solvent and no supporting electrolyte, through electrochemical driving, the electrochemical performance of the electrochemical system is improved. The selective halogenation of carbon-hydrogen bonds of the anode and the dehalogenation deuteration reaction of the cathode are synchronously realized, the two half reactions are successfully and efficiently coupled in the same reactor, and the deuterated organic compound with high additional value is directly synthesized. According to the method, a large amount of organic solvents and electrolyte salts used in traditional organic synthesis are abandoned, the environmental load and post-treatment difficulty of the reaction are remarkably reduced, and the method has the outstanding advantages of being simple in process, environmentally friendly and high in atom economy.

The application discloses a preparation method and equipment of diethyl methyl phosphite, and belongs to the technical field of chemistry and chemical industry. The preparation method of diethyl methyl phosphite comprises the following steps: (1) reacting aluminum powder and chloromethane to obtain a sesqui-reaction solution; (2) mixing phosphorus trichloride, a solid acid catalyst and the sesqui-reaction solution and reacting; (3) removing the phosphorus trichloride, adding sodium chloride and performing a dissociation reaction to obtain methyl phosphorus dichloride and sodium tetrachloroaluminate; and (4) putting the methyl phosphorus dichloride, ethanol, liquid nitrogen and isohexane into an esterification reaction kettle, performing an esterification reaction, purifying and obtaining pure diethyl methyl phosphite. The application further discloses an esterification reaction kettle which comprises a barrel, a feeding pipe, a stirring main shaft and a special-shaped umbrella body, and the surface of the special-shaped umbrella body is provided with grooves. The preparation method has high product purity and high yield, and the equipment is uniformly stirred, so that the reaction can be completely performed.

The utility model relates to the technical field of ammonia production equipment, in particular to a urea hydrolysis ammonia production reaction device which comprises a main reaction tank, and the top end of the main reaction tank is fixedly connected with a disassembly and assembly connecting piece; firstly, a tank body is conveniently disassembled and cleaned through an assembling structure of a main reaction tank, a disassembling and assembling connecting piece and an upper half reaction tank which are convenient to disassemble, and in the process of preparing ammonia through urea hydrolysis, a driving motor assembled at the top end of a top cover is guided to operate to drive a stirring rod to rotate and stir an internal urea solution; meanwhile, the extension bracket drives the leak plate to stir in the main reaction tank along with the rotation of the stirring rod, and the contact area and time of urea and hot steam during hydrolysis are accelerated through the through holes formed in the leak plate.